Pauline mysticism is a big, complicated idea that talks about how people can connect with God in a deep and personal way, just like the Apostle Paul did.
Now, Paul was a very important person in the Bible, and he wrote a lot of letters that people still read today. He had a super special relationship with God, and he talked about how he felt God's love and presence in his life all the time.
Basically, Pauline mysticism is when someone tries to have a relationship with God that's just as special and close as the one Paul had. That means they might spend lots of time praying, reading the Bible, or just thinking about how God is always with them.
It's like having a really best friend who you know loves you and is always there for you. People who believe in Pauline mysticism think that having a close relationship with God like this can help them feel more peaceful, loved, and connected to the world around them.